Supports building gtest as a DLL (by Vlad Losev).

include/gtest/internal/gtest-death-test-internal.h

@@ -64,7 +64,7 @@ const char kInternalRunDeathTestFlag[] = "internal_run_death_test";
 //               by wait(2)
 // exit code:    The integer code passed to exit(3), _exit(2), or
 //               returned from main()
-class DeathTest {
+class GTEST_API_ DeathTest {
  public:
   // Create returns false if there was an error determining the
   // appropriate action to take for the current death test; for example,
@@ -147,7 +147,7 @@ class DefaultDeathTestFactory : public DeathTestFactory {
 
 // Returns true if exit_status describes a process that was terminated
 // by a signal, or exited normally with a nonzero exit code.
-bool ExitedUnsuccessfully(int exit_status);
+GTEST_API_ bool ExitedUnsuccessfully(int exit_status);
 
 // This macro is for implementing ASSERT_DEATH*, EXPECT_DEATH*,
 // ASSERT_EXIT*, and EXPECT_EXIT*.